Method of producing a doublewalled container



Nov. 28, 1939. H. K. KIMBLE METHOD 0F PRODUC-ING A DOUBLE-WALLED CONTAINER Filed oci. 9, 193s i INVEMOR.

Herman K. Kimble.

ATTORNEY.

, PatentedjNouQ-'28fl939 UNirED STATE-s.

PATENT ol-Flclz 5 2,181,240 mamon or' rnonvcmo, a 'nonamwam CGNT

AINER Henman x. Klinlneyinelnna, N. J. ilpnliontion ootober s, me, serial No. 104.793

' s claims. A(ci. 4ta-sz) This invention 'relates to doubles-walled oon-r taine/rs and to a method for producing the same. One of the primary objects ofthis invention is to provides, double-walled container in whiche 6 the mouth or neckportion is made of substan- Further objects and advantages' ofthe invention will become more apparent as the following ,description proceeds particularly when reference is had to the accompanying drawing wherein:-

- Fig. 1 is a longitudinal sectional view throug'h'-A a container'constructedin accordance with the t is preferably provided exteriorly adjacent the teachings of this invention;

Fig. 2 ls a sectional view throngh the container '20 showing the parts thereof in spaced relation to each other and as they appear before theconi f; by an ordinary cork in accordance with the tainer ls assembled;

Fig. 3 is ,o longitudinal sectional view through a modied type of outer vessel which might be l the double-walled container and this vessel is '85 utilized; l

Fig. 4 is a sectional view through a modied type of inner yessel which may be utilized; and j Figs. 5 to 9 inclusive, are fragmentary sectional-` views showing various modications of the suri0 faces at which the parts of the container are' sealed together.

f In the production of double-walled containers,` the-practicewhich is generally followed is I to seal one vessel within another.- The methods i how practiced' require cost are particularly weak at the terminationso that a closure may be applied to the container,

the container is thus subjected to the greatest strain at its Weakest point.

To eliminate these disadvantages, the present invention contemplates the production of a double walled container in which the seals are pro- I tected and the- 'neck or section of the container to which 'a closure is to be applied is made the strongest -,part of the Containern. .Fur-ther, the

i invention lcontemplates the-provisionof nmethod whereby the seals between the inner and-outer 55' vessels may be effected in an evacuated chambe described.

and slow nialzilpu-v f lation of the vessels and lproduce containe l which of the necks or open ends of the containers where ber so thaty thedouble-walled containers may be economically produced on a commercial scale. Referring now to the drawing wherein like reference characters designate corresponding parts throughout all views, the numeral I0 des- 5 ignates generally one of the elements or parts which are utilized in producing the container. The part I0 comprises a tubular member II which terminates at one end in a mouth I2 andat its other end in an edge or surface I3 for a l0 purpose which will later by described. 'Ihe tubular member II is also-provided with a depending sklrt Il which terminates in an edge or surface I5, the purpose of which will alsolater The .element I0 may be madein any desiredv manner as by molding, pressing or the like,- and mouth I2 with screwthreads I6 so Athat a screw cap closure may be utilized, if desired. Obvi- 20 ously,A the mouth of the memberl I0 may be closed usual practice.

The numeral 20 designates the inner vessel of provided with the open end 2Ivwhich is defined by an edge or surface 22. The edge or surface 22 is-welded 'or sealed to the surface I3 so that the part I Ii is thus sealed to and becomes substantially integral with the vessel 20. 'I'he sur- 30 faces or edges I3 and 22 are made of a thickness suitable for heat welding' or may be made somewhat thicker to provide a wider surface for soldering or the like.

Afterv the vessel 2Il isi/.sealed to he part I0,t 85 the ou de surface of the vessel 201e. coated with l a silv Ior other deposit asf/is also -the-inside surface of .the vessel 25 which constitutes the outer vessel of the double-walled container. The

vessel 25 is provided with an edge or surface 26 40 lwhich is adapted to be sealed to the edge I5 of the part I0, and this sealing may be effected either by heat welding or by solder or other suitable sealing means.

It will be apparent that whenthe inner vessel 45 20 is sealed to the tubular (element I I and the outer vessel 25 is sealedA to the skirt I4, a double-walled container such as illustrated in'Fig.

"1 is produced: It will be noted that while the body portion of the container is double-walled, the mouth or neck portion :thereof isf'dened' by asingle'walh 'Ihus the mouth or neck of the vessel which is generally exposed andsubjected to the greatest shocks, lbecomes the strongest part of the container, while theA seals between 55 the inner and outer 'vessels and the portion IB of the container are located a substantial'distance from the mouth of the container with the effected in an evacuated chamber. The edges I sealing may be effected by an Aaluminum solder and 26 may be heated .while the chamber isV under negative pressure, or the edges may iirst be heated and then the chamber brought under negative pressure with the result that a negative 'pressure exists in the space between the inner vand outer vessels.

It will be understood, of course, that the edges I5 and 26 are heated until they become sufficiently plasticl so thatv they may be welded together.

Instead of effecting a sealing of the inner and outer vessels to the part IIlby heat welding, this or some other similar soldering compound. This is accomplished byapplying the soldering compound at a predetermined temperature to the edges I3 and 22 andthe edges I5 and 26, while the parts I0, 20' and 25 of the container are within the chamber under negative pressure.I

If desired, the sealing of the` outer vessel to the part I0 may be done under atmospheric pressure, the insulating medium for the doublewalled container being placed in the space between the inner and outer vessels before the sealing is commenced. Any insulating material may be used such for example, as glass wool, mineral wool, Silocel or the like.

In Fig. 3 there is disclosed a slightly modiiled v type of outer vessel which may, if desired, be utilized instead ofthe outer vessel shown in Fig. 2. This modied type of outer vessel is provided with a tubulation 30 which may be placed at any parto f the vessel but can most conveniently be located as shown, at the bottom ofthe vessel.

This tubulation serves a two-fold purpose namely, to admit air between the inner 'and outer vessels during the welding or sealing process and as a fitting to which an evacuating means may be attached to exhaust the air between the inner and outer vessels after the sealing is eiected. After the space between the inner and outer vessels has been brought to the desired negative pressure, the tubulation 30 is sealed by applying heat to the same;v in a well-known manner.

In Fig. 4 a slightly modified type of inner vessel is illustrated. In this embodiment of the vinventionthe mouth and the inner vessel are made integral this being accomplished by any of the well-known methods such, for example, as the press and blow method. `It will VAbe obvious that with the part In integralwith the part 2li, an

outer vessel may be sealed to the skirt Il*1L in any of the manners previously described. 1

As previously mentioned, the edges between which sealing is to be-effected are made of a thickness suitable for heat welding or somewhat thicker to present a. wider surface for solder or Additionally, thesel edges other sealing means. may be formed in any ofthe manners illustrated in Figs. Eeto 9 inclusive depending upon themanner in which the edges are to be sealed together.

From the above it will be apparent that the invention provides a double-walled container in which the neck portion or thatportion which is unprotected and subjected to the most shocks is made 'of a single thickness and thus suillciently strong soas to resist the shocks andstrains to tained by sealing the outer vessel of the container to the remaining part thereof in a chamber which is maintained underthe desired negative pressure. The methods may be economically carried out on a commercial scale thus providing for thel production of double-walled .containers at substantially less cost than has heretofore been possible.

It might be noted that by producing a doublewalled containerin accordance with the teachings of this invention, the spacers which are v usually located between the inner and outer vessels may, if desired, be eliminated. The fact that the inner and outer vessels are rigidly sealed to the preformed part I0, insures that the vessels will be securely held in spaced relation to each other.

While the invention has been described with some detail, it isto be understood that the description is for the purposes of illustration only andthe right is reserved to make such changes -in the details of construction and the steps of the method as will fall within the purview of the attached claims.

What I claim as my invention is:

1. The method of forming a, double-walled container which consists in forming a neck section having spaced apart free edges one of which surrounds the other, Aand thereafter sealing a ves-l and outer vessels to one end of said mouthv andneck section.

3. The method of producing a double-walled container which consists in forming a neck section having a free edge portion surrounded by a depending skirt, then sealing an inner vessel to the said free edge portion of the neck section, and thereafter sealing an outer vessel tothe free edge portionof the depending skirt.

4. The method of forming a double-walled con# tainer which consists in forming -a'neck section having. a free edge surrounded by a depending skirt, then sealing an inner vessel to the said free edge of the neck section, thereafter sealing an outer vssel to the free edge of the depending skirt, and exhausting the air from the space between thetwo'vessels.

5. A method 'of producing a double-walled glass container which consists in forming a singlewalled neck section having adepending skirt connected to the neck section in a plane spaced from the open end thereof, said neck vhaving an inner vesselintegrallygunited thereto land said skirt having its freeL edge spaced radially outward from the neck and having a cross section substantially Agreater than the cross section of the inner vessel, thev skirtterminating adjacent the zone of union of the neck and inner vessel, forming an outer vessel having a closed end and an open end, the latter end` having dimensions cor'- responding to those of the free edge of the depending skirt, the outer vessel Qbeing of a length to HERMAN K. KIMBLE. f5 

